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leo1111

1.        Since the 1930’s aircraft manufacturers have tried to build airplanes with frictionless wings, shaped so smoothly and perfectly that the air passing over them would not become turbulent.

(A) wings, shaped so smoothly and perfectly

(B) wings, wings so smooth and so perfectly shaped

(C) wings that are shaped so smooth and perfect

(D) wings, shaped in such a smooth and perfect manner（B）

(E) wings, wings having been shaped smoothly and perfectly so

对这道题本人一头雾水，请高人指点。

LES

http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=15954

在置顶的帖子里可以先搜索一下。

leo1111

感谢LES的回复！！！